//#define  _CRT_SECURE_NO_WARNINGS
//#include <stdio.h>
//#include <string.h>
//int main()
//{
//	char arr1[] = "xxxxxxxxxxxxxxxxxxxxx";
//	char arr2[] = "hello world";
//	strcpy(arr1, arr2);
//	printf("%s\n", arr1);
//	return 0;
//}